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▶️ Server sends non-numeric status code, fail gracefully
▶️ Server sends non-space after status code, fail gracefully
▶️ Server sends meta larger than 1024 bytes, fail gracefully
Gemini response headers look like this:
<STATUS><SPACE><META><CR><LF>
<STATUS> is a two-digit numeric status code, as described below in 3.2 and in Appendix 1.
<META> is a UTF-8 encoded string of maximum length 1024 bytes, whose meaning is <STATUS> dependent.
<STATUS> and <META> are separated by a single space character.
If <STATUS> does not belong to the "SUCCESS" range of codes, then the server MUST close the connection after sending the header and MUST NOT send a response body.
If a server sends a <STATUS> which is not a two-digit number or a <META> which exceeds 1024 bytes in length, the client SHOULD close the connection and disregard the response header, informing the user of an error.